<!--
 * @Author: Jackie
 * @Date: 2020-11-28 15:52:45
 * @LastEditors: Jackie
 * @LastEditTime: 2020-11-28 20:57:08
 * @Description: 登录组件
 * @FilePath: \vue\vue_shop\src\components\Login.vue
-->
<template>
  <div class="loginContainer">
      <!--登录盒子-->
      <div class="login_box">
          <!--默认头像-->
          <div class="avatar_box">
              <img src="../assets/logo.png" alt="">
          </div>
          <!--登录表单区域-->
          <el-form ref="loginFormRef" :model="loginForm" :rules="loginFormRules" label-width="0px" class="loginForm">
              <!--用户名-->
                <el-form-item prop="username">
                    <el-input 
                    prefix-icon="el-icon-user-solid"
                    placeholder="请输入用户名/邮箱"
                    v-model="loginForm.username"
                    >
                    </el-input>
                </el-form-item>
                <!--密码-->
                <el-form-item prop="password">
                    <el-input 
                    prefix-icon="el-icon-lock"
                    placeholder="请输入密码"
                    v-model="loginForm.password"
                    type="password"
                    >
                    </el-input>
                </el-form-item>
                <!--按钮-->
                <el-form-item class="btns">
                   <el-button type="primary" @click="login">登录</el-button>
                   <el-button type="info" @click="resetLoginForm">重置</el-button>
                </el-form-item>
          </el-form>         
      </div>
  </div>
</template>

<script>
export default {
    data(){
        return{
            //这是登录表单的数据绑定对象
            loginForm:{
                username:"admin",
                password:"123456"
            },
            //这是表单的验证规则对象
            loginFormRules:{
                username:[
                    { required: true, message: '请输入登录用户名/邮箱', trigger: 'blur' },
                    { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
                ],
                password:[
                    { required: true, message: '请输入登录密码', trigger: 'blur' },
                    { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
                ]
                
            }
        }
    },
    methods:{
        //点击重置按钮，重置登录表单
        resetLoginForm(){
            this.$refs.loginFormRef.resetFields();
        },
        login(){
            this.$refs.loginFormRef.validate(async valid=>{
                if(!valid) return;//如果表单验证为false怎返回
                //否则，发起axios请求
                //接口路径login，post请求，参数是username和password(可以直接引用data中的loginForm)
                //因为loginForm已经数据绑定到表单了
                const {data:res}=await this.$http.post("login",this.loginForm);
                if(res.meta.status!==200) return this.$message.error("登录失败");
                this.$message.success("登录成功")
                // 1.将登陆成功之后的token，保存到客户端的sessionStorage中
                // 1.1项目中登录之外的其他接口，必须在登录之后次啊能访问
                // 1.2token只应在当前网站打开期间生效，所以将token保存在sessionStroage中
                window.sessionStorage.setItem("token",res.data.token);
                // 2.通过编程式导航跳转到后台主页，路由地址是/home
                this.$router.push("/home")
            });
        }
    }
}
</script>

<style lang="less" scoped>
.loginContainer{
    height: 100%;
    background-color:#2b4b6b ;
}
.login_box{
    width: 450px;height:300px ;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;top: 50%;
    transform: translate(-50%,-50%);
    .avatar_box{
        height:130px;
        width:130px;
        border:1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%,-50%);
        background-color: #fff;
        img{
            width: 100%;height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}
.loginForm{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
    .btns{
    display: flex;
    justify-content:flex-end ;
    }
}
</style>